Improvement in locking-latches



I plete.

UNITED STATES PATENT OEEICE ABRAHAM T. WILLIAMSON, OF RINGOES, NEW JERSEY, EXEOUTOR OF 1 JACOB YV. WILLIAMSON, DEGEASED.

IMPROVEMENT IN LOCKINGwLATCHE Specification forming part of Letters Patent No. 157,257, dated November 24, 1874 application filed October 10, 1874.

To all whom t may concern:

Beit known that JACOB W. WILLIAMSON, late of Ringoes, deceased, in the county of Hunterdon and State of New Jersey, did invent certain new and useful Improvements in Locks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to ina-ke and use it, reference being had to the accompanying drawings, which form part of this specification, in which- Figure l is a perspective view of lock com- Figs, 2, 3, and 4 are details.

This invention-has relation to a combined door lock and latch and it consists in the novel construction and combination of a pivoted latch, tumbler-arm, key-slide, and eyeplate, whereby the locking and unlocking of the latch can only be efected by peculiar manipulation of the key, as hereinafter specilically set forth.

Referring to the accompanying drawings, A designates the lock-case, and B the latch. The latter is of a very peculiar shape, and cornprises two principal parts-the arm a and bar b, lying, respectively, lengthwise and crosswise of the case. The upper end of the bar b is formed with an eye, c, through which passes a pin, pivoting the latch to the case in one of the upper corners. The said bar bears the beveled latch -projection d, which plays through a suitable opening in the end of the case. D is a cam attached to the knob-shaft and located within a recess, E, formed in the rear end of the latch-arm a. Vhen the knob is turned either to the right or left the arm a is raised by the pressure ofthe cam-wings or facets c1 el against the curved surfaces eZ c2 of the arm, and the latch turned upon its pivot so as to withdraw the beveled projection d. The latch can only be moved, however, when released from the locking mechanism, to be presently described. When the cam assumes the position shown in Fig. l, which it will of its own weight, or of the weight of a suitable pendent knob, the arm c will fall automatically, so as to throw outward the projection d. In closing the door, the latch is operated through the pressure ofthe part d against the to the case.

keeper. Of the mechanism for locking, E designates a curved arm, pivoted to the case atits upper end, and slotted in the direction of its length at F. Through the slot F the arm a of the latch passes, and plays freely, said arm being recessed at c2 for such purpose. F are prongs projecting from the lower end of the arm E', so as to embrace between them and within the slot F the recessed portion ofthe latch-bar b, located behind the projection d, and lettered d. G designates a slotted slide, resting upon the bottom of the lockcase, and guided by means of a stop-pin, g, and bevel projections g1 g2, attached rigidly Upon its upper portion, said slide has a transverse semicircular recess, 7L, and on its lower edge a longitudinal beveled groove, h1, and transverse beveled groove 11.2. I is a plate arranged across the recess h, and constructed with a central eye, i, and one or more concentric wards, i2, forming segmental channels i3. The forward end of the slide is tenoned so as to enter the slot F of the bar E behind the prongs F. At the base of said prongs notches or rabbets fare made for the reception of projections f, formed by channeling the slide at the sides and base of the tenoued end, as shown. K designates the keyhole, and K the key.

The operation of the locking mechanism is as follows: The slide being in such a position that the eye i shall be on the opposite side `of the key-hole from the bar E', the key is inserted with the shank below the bit, and is then turned toward the eye c', and the projection 7c inserted in the latter. The key is then turned in the opposite direction, thereby lifting the slide above the blocks g1 g2, and conveying it forward until the groove h2 and block g2 coincide, when it is lowered upon the bottom of the case. As the slide moves, it forces the arm E in front of it, causing the prongs F' F' to enter the recesses d. After the slide descends, its end, touching the bar b, acts a stop, preventing the latch from being moved back by external appliances. Upon the descent of the slide, the arm E being released, recedes, until its lower end lies in the recess h, and the lugs or stops 7c on the ends of the prongs touch the slide, as shown. The

blocks g1 g2 oecupyin g, when the latch is locked, respectively the notches h3 h2, prevent the slide from being pushed back unless it is rst lifted. The object of the arm E is to prevent the required raising of the slide, except upon the insertion and proper manipulation of the key. To unlock the latch, assuming the parts to be iu the position shown in the drawing, the key is inserted and rst turned toward the eye i, (which is 110W guarded by the arm E,) so as to raise said arm and admit the projection 7s to said eye. The key is then turned in the opposite direction, whereupon the slide is lifted and moved back, so as to leave the latch free.

have hereunto set my hand this 11th day of September, 1874. 1

ABRAHAM T. WILLIAMSON, Executor ojJoLcob Willmnson, deceased. /Vitnesses:

WILLIAM S. RILEY, ALEXANDER WURTs. 

